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Title: Local Structure around In Atoms in InxGa1-xN Multi-Quantum-Wells Studied by XAFS

Abstract

Indium K-edge EXAFS measurements were carried out to study local structures around In atoms in InxGa1-xN multi-quantum-well (MQW) structures of 10 periods with In0.2Ga0.8N (2.5 nm) and In0.05Ga0.95N (7.5 nm). We found the following: (1) Debye-Waller factors for In-In and In-Ga atomic pairs in MQW are smaller than those in single QW (SQW) InxGa1-xN. (2) The differences in the interatomic distances of In-In and In-Ga between the horizontal and vertical direction are small. These results indicate that the strain in the InxGa1-xN layer is reduced in MQW in comparison to SQW. (3) In atoms are randomly distributed in both the horizontal and vertical directions of the sample.

Authors:
; ;  [1]; ;  [2];  [3];  [4];  [5]
  1. Department of Advanced Physics, Faculty of Science and Technology, Hirosaki University, Hirosaki, Aomori 036-8561, (Japan)
  2. SPring-8/JASRI, 1-1-1 Koto, Sayo-cho, Sayo-gun, Hyogo 679-5198 (Japan)
  3. Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573 (Japan)
  4. (Japan)
  5. Department of Electrical Engineering and Bioscience, Waseda University, Shinjuku, Tokyo 169-8555 (Japan)
Publication Date:
OSTI Identifier:
21054665
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 882; Journal Issue: 1; Conference: XAFS13: 13. international conference on X-ray absorption fine structure, Stanford, CA (United States), 9-14 Jul 2006; Other Information: DOI: 10.1063/1.2644572; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTROSCOPY; COMPARATIVE EVALUATIONS; CRYSTAL STRUCTURE; DEBYE-WALLER FACTOR; FINE STRUCTURE; GALLIUM NITRIDES; INDIUM; INDIUM NITRIDES; INTERATOMIC DISTANCES; LAYERS; QUANTUM WELLS; SEMICONDUCTOR MATERIALS; STRAINS; X-RAY SPECTROSCOPY

Citation Formats

Sasaki, Shinya, Miyanaga, Takafumi, Azuhata, Takashi, Uruga, Tomoya, Tanida, Hajime, Chichibu, Shigefusa F., Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, and Sota, Takayuki. Local Structure around In Atoms in InxGa1-xN Multi-Quantum-Wells Studied by XAFS. United States: N. p., 2007. Web. doi:10.1063/1.2644572.
Sasaki, Shinya, Miyanaga, Takafumi, Azuhata, Takashi, Uruga, Tomoya, Tanida, Hajime, Chichibu, Shigefusa F., Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, & Sota, Takayuki. Local Structure around In Atoms in InxGa1-xN Multi-Quantum-Wells Studied by XAFS. United States. doi:10.1063/1.2644572.
Sasaki, Shinya, Miyanaga, Takafumi, Azuhata, Takashi, Uruga, Tomoya, Tanida, Hajime, Chichibu, Shigefusa F., Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, and Sota, Takayuki. Fri . "Local Structure around In Atoms in InxGa1-xN Multi-Quantum-Wells Studied by XAFS". United States. doi:10.1063/1.2644572.
@article{osti_21054665,
title = {Local Structure around In Atoms in InxGa1-xN Multi-Quantum-Wells Studied by XAFS},
author = {Sasaki, Shinya and Miyanaga, Takafumi and Azuhata, Takashi and Uruga, Tomoya and Tanida, Hajime and Chichibu, Shigefusa F. and Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573 and Sota, Takayuki},
abstractNote = {Indium K-edge EXAFS measurements were carried out to study local structures around In atoms in InxGa1-xN multi-quantum-well (MQW) structures of 10 periods with In0.2Ga0.8N (2.5 nm) and In0.05Ga0.95N (7.5 nm). We found the following: (1) Debye-Waller factors for In-In and In-Ga atomic pairs in MQW are smaller than those in single QW (SQW) InxGa1-xN. (2) The differences in the interatomic distances of In-In and In-Ga between the horizontal and vertical direction are small. These results indicate that the strain in the InxGa1-xN layer is reduced in MQW in comparison to SQW. (3) In atoms are randomly distributed in both the horizontal and vertical directions of the sample.},
doi = {10.1063/1.2644572},
journal = {AIP Conference Proceedings},
number = 1,
volume = 882,
place = {United States},
year = {Fri Feb 02 00:00:00 EST 2007},
month = {Fri Feb 02 00:00:00 EST 2007}
}
  • The geometric structures for ferromagnetic Zn1-xCrxTe films grown by molecular beam epitaxy were investigated by fluorescence XAFS measurements in order to elucidate the relationship between the geometric structure and the magnetic properties. XAFS analysis suggested that the majority of Cr atoms doped in CrTe substituted the Zn-site in the ZnTe lattice below the Cr content x = 0.048, and formed Cr-Te compounds such as Cr2Te3 and CrTe above x = 0.090. It is suggested that ferromagnetism of the Zn1-xCrxTe films above x = 0.090 is due to the formation of Cr-Te compounds.
  • the local environment about oxygen atoms in the CuO{sub 2} plane in YBa{sub 2}Cu{sub 3}O{sub 7} single crystals has been investigated by orientation-dependent x-ray absorption fine structure (XAFS) spectroscopy at the O 1s edge using bulk-sensitive fluorescence-yield-detection method. Within experimental accuracy ({plus minus}0.03 A) no structural change in local ordering about oxygen atoms in the CuO{sub 2} plane at 90 K has been detected.
  • The local environment about oxygen atoms in the CuO{sub 2} plane in YBa{sub 2}Cu{sub 3}O{sub 7} single crystals has been investigated by orientation-dependent x-ray absorption fine structure (XAFS) spectroscopy at the O ls edge using bulk-sensitive fluorescence-yield-detection method. Within experimental accuracy ({plus minus}0.03 {Angstrom}) no structural change in local ordering about oxygen atoms in the CuO{sub 2} plane at 90 K has been detected. 14 refs.
  • The local environment about oxygen atoms in the CuO{sub 2} plane in YBa{sub 2}Cu{sub 3}O{sub 7} single crystals has been investigated by orientation-dependent x-ray absorption fine structure (XAFS) spectroscopy at the O ls edge using bulk-sensitive fluorescence-yield-detection method. Within experimental accuracy ({plus_minus}0.03 {Angstrom}) no structural change in local ordering about oxygen atoms in the CuO{sub 2} plane at 90 K has been detected. 14 refs.
  • The local order around Mn atoms in the Mn-implanted Si samples, with ferromagnetic properties, has been investigated by use of x-ray-absorption spectroscopy techniques. Analysis of both extended x-ray-absorption fine structure and x-ray absorption near-edge structure spectra clearly indicates that Mn ions are located neither in the substitutional nor in the interstitial position in the Si lattice, but depending on how the samples were prepared, they have five to eight near neighbors.